curtis



F. C. CURTIS.

METALLURGICAL FURNACE.

APPLICATION FILED AUG-l2, 1918.

1,37 5,680. Patented May 3, 1921.

Inaenior $43146 fiv W22,

, UNITED srarnsmrsnr attics.

FRANK C. CURTIS, OF TROY, NEW YORK.

Specification of Letters Patent.

METALLURGICAL FURNACE.

Patented May a, 1921.

Application filed August 12, 1918. Serial No. 249,418.

a To all to hom it may concern.

marked thereon, which form 'part of this specification. 7 v

Similar characters refer to similar parts in the several figures therein.

This invention relates to metallurgical furnaces adapted forthe burning of fluidfuel, such as gas or oil.

The principal objects of the invention are to effectively use the fluid-fuel, and to facilitate the repair and reconstruction of the furnace.

Other objects will appear in connection with the following description.

Figure 1 of the drawings is a view in side elevation of a furnace embodying my invention, the furnace being mounted upon rockers, and shown in tilted position as in charging and discharging.

Fig. 2 is a central vertical longitudinal section of the same.

Fig. 8 is a cross-section of the same taken on the broken line, 3-3, in Fig. 1.

Fig. 4: is a similar view of a trunnion supported furnace embodying my invention.

Referring to the drawings wherein the invention is shown in preferred form, the hearth of the furnace may be made in the usual manner, comprising a metal shell, 1., lined with refractory material such as firebrick, 2.

The roof may be similarly made of a metal shell, 3,lined with refractory material such as fire-brick 4t.

The roof is removably supported upon the hearth.

The roof and the hearth are so formed that their interior surfaces convergently curve toward oppositely disposed openings 8, at the ends of the longitudinal axis of the furnace, the furnace being elongated, and tiltably mounted upon rockers, 5, as shown in Figs. 1 and 3, or upon trunnlons, 15, disposed along its transverse axis as shown in Fig. 4:.

The furnace may be tiltably mounted in any known manner.

Fluid-fuel burners, 6, are mounted upon the furnace directed toward an inner surface of the roof, 2, so that the flames from the burners shall impinge upon and highly heat said surface causing the heat 'to radiate therefrom to' the charge upon the hearth.

The burners may be mounted upon any part of the furnace, directed toward the inner surface of the roof so that the flames from the burners impinge upon the inner surface of the roof; but I prefer the arrangement shown in the drawings in which- The end-openings, 8, serve for charging and discharging the furnace; and they may be closed by removable doors, 9, in any known manner.

In using fluid-fuel, it is desirable to use an inspirator 10, for automatically regulating the supply to the burners and for maintaining a substantially uniform temperature within the furnace.

I have shown the inspirators, 10, mounted upon the furnace, and preferably mounted upon the removable top or roof of the furnace.

It will be understood that the illustration of the inspirators is diagrammatic only, as I do not wish to be limited to any particular type of inspirators and any known form of same may be employed.

The fuel-supply for the inspirators, 10, and burners, 6, may be transmitted through the trunnions, 15, which are made hollow for that purpose, as shown in Fig. 4, or in any other known manner permitting the tilt ing of the furnace.

In Fig. 1, I have shown flexible pipe-coir nections, 16, for supplying gas and air to the inspirator and burners, which connections permit tilting of the furnace.

For certain purposes of the invention, it is immaterial whether the inspirator and burners are mounted upon the removable roof or other part of the furnace so long as the burners are directed toward an inner surface of the roof.

The term roof may mean any part of the furnace above the level of the charge on the hearth.

The burners and inspirators may be of metal into a ladle, 17, while receiving a new or additional charge from the ladle, 18. V The furnace is adapted fOPHlGltlng and refining metal ores, metal scrap 85c.

While I have shown and'described my invention in its preferred form as applied to a metallurgical furnace, in which it is de sirable to tilt the furnace to discharge the molten metal, it will be apparent that the furnace can be used to melt, refine or fire whatever material may be placed within it; and that certain features of the invention are applicable to many different kinds of furnaces. Y

WhatI claim is:

1. A "metallurgical furnace having a hearth, a removable roof, anda fluid-fuel burner directed toward an inner surface of said roof;

2. A metallurgical furnace having a hearth, and a removable roof, both elongated, and having their inner surfaces convergently curved toward openings at the oppositely disposed ends of the longitudinal axis of the furnace; and a fluid-fuel burner directed toward a inner surface of said roof.

3. A metallurgical furnace havin a hearth, and a removable roof, and a libidfuel burner mounted upon said roof directed toward an inner surface thereof.

4. A metallurgical furnace having a hearth, and a roof, said furnace being tiltably mounted, and having mounted thereupon a fluid-fuel burner and an inspirator therefor, said burner being directed toward an inner surface of said roof.

5. A metallurgical furnace having a hearth, and a roof, said furnace being elongated and tilt-ably mounted upon its shorter axis, and provided at the ends of its longer axis with door-closed openings, and having a fluid-fuel burner directed toward an inner surface of said roof.

6. A fluid-fuel-heated furnace having a fiuid-fuel-burner directed toward an interior heat-radiating surface at the top of the furnace; and having a top-portion, including said heat-radiating surface toward which said burner is directed, removably mounted with respect to the subjacent baseportion of the furnace.

In testimony whereof, I have hereunto set my hand this 8th day of August, 1918.

FRANK O. CURTIS. 

